Pen shell



FIG. 1 is a perspective view showing my new design.

FIG. 2 is a front view thereof.

FIG. 3 is a rear view thereof.

FIG. 4 is a left end view thereof.

FIG. 5 is a right end view thereof.

FIG. 6 is a left side view thereof; and,

FIG. 7 is a right side view thereof. 

The ornamental design for a pen shell, as shown. 